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This mock test of Circular Motion MCQ Level - 2 for Physics helps you for every Physics entrance exam.
This contains 10 Multiple Choice Questions for Physics Circular Motion MCQ Level - 2 (mcq) to study with solutions a complete question bank.
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students definitely take this Circular Motion MCQ Level - 2 exercise for a better result in the exam. You can find other Circular Motion MCQ Level - 2 extra questions,
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QUESTION: 1

A particle initially at rest starts moving from point ** A** on the surface of a fixed smooth hemisphere of radius

Solution:

Let ** v** be the speed of particle of

From application of Newton's second law to the particle normal to the spherical surface.

Applying conservation of energy as the block moves from ** A** to

Solving 1 and 2 we get

The correct answer is:

QUESTION: 2

A bob is attached to one end of a string other end of which is fixed at peg ** A**. The bob is taken to a position where string makes an angle of 30° with the horizontal. On the circular path of the bob in vertical plane there is a peg ‘

Solution:

For anti-clockwise motion, speed at the highest point should be Conserving energy at (1) and (2) :

For clock-wise motion, the bob must have atleast that much speed initially, so that the string must not become loose any where until it reaches the peg **B**.

At the initial position :

** v_{c}** being the initial speed in clockwise direction.

For

The correct answer is: (1 : 2)

QUESTION: 3

The sphere at ** P** is given a downward velocity

Solution:

The correct answer is:

QUESTION: 4

A simple pendulum is oscillating in a vertical plane. If resultant acceleration of bob of mass ** m** at a point

Solution:

When the acceleration of bob is horizontal, net vertical force on the bob will be zero.

The tangential force at that instant is

The correct answer is:

QUESTION: 5

A uniform rod of mass *m* and length ** l** is rotating with constant angular velocity ω about an axis which passes through its one end and perpendicular to the length of rod. The area of cross section of the rod is

Solution:

QUESTION: 6

A small coin of mass 40 ** g** is placed on the horizontal surface of a rotating disc. The disc starts from rest and is given a constant angular acceleration α = 2 rad/s

Solution:

The friction force on coin just before coin is to slip will be : ** f** =

Normal reaction on the coin

The resultant reaction by disk to the coin is

The correct answer is: 0.5 *N*

QUESTION: 7

Objects ** A** and

Solution:

From length constraint on *AB*

** a** =

mg – ma = ma

2ma = mg

a = g/2

The correct answer is:

QUESTION: 8

A disc of radius ** R** has a light pole fixed perpendicular to the disc at the circumference which in turn has a pendulum of length

Solution:

The bob of the pendulum moves in a circle of radius

QUESTION: 9

A bead of mass ** m** is located on a parabolic wire with its axis vertical and vertex at the origin as shown in figure and whose equation is

Solution:

* x* = 4

Differentiating w.r.t.

the component of weight along tangential direction is mg sin θ

hence tangential acceleration is

The correct answer is:

QUESTION: 10

A weight ** W** attached to the end of a flexible rope of diameter

Solution:

As tangential acceleration * a* =

but ω = 4π and

∴ a = 6π

Now by the F.B.D. of the mass

∴ * T* =

Put a = 6π

∴

The correct answer is: 1.019

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### Circular Motion (Part- 2)

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